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Problem: Deuterium (Subscript 1 Superscript 2 Baseline H) is an attractive fuel for fusion reactions because it is abundant in the waters of the oceans. In the oceans, about 0.0135% of the hydrogen atoms in the water (H₂O) are deuterium atoms.

Part I: How many deuterium atoms are there in one kilogram of water?

Part II: If each deuterium nucleus produces about 7.20 MeV in a fusion reaction, how many kilograms of ocean water would be needed to supply the energy needs of a large country for a year, with an estimated need of 8.10 x 10²⁰ J?

I need tutor help to solve the above question and thanks in advance.

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